Zehnder ComfoValve Luna is a family of innovative air disc valves designed to take full advantage of the Coanda effect. This is when air sticks to surfaces as it moves, minimizing draft noise and creating a more comfortable atmosphere. Protruding just 30 mm, these patented valves can easily be mounted on walls or ceilings and come in two colors. This means you get a timeless look that blends seamlessly into any space. With different setting positions, the ComfoValve Luna E extracts air anywhere in your home.